We would like to pass 'brakeman -w2'

lib/tasks/brakeman.rake

 desc 'Security check via brakeman'
 task :brakeman do
+  # We get 0 warnings at level 'w3' but we would like to reach 'w2'. Merge
+  # requests are welcome!
   if system("brakeman --skip-files lib/backup/repository.rb -w3 -z")
     puts 'Security check succeed'
   else